• Title, Summary, Keyword: estrogenic compound

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Anti-Estrogenic Activity of Lignans from Acanthopanax chiisanensis Root

  • Lee Sanghyun;Yoo Hye Hyun;Piao Xiang Lan;Kim Ju Sun;Kang Sam Sik;Shin Kuk Hyun
    • Archives of Pharmacal Research
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    • v.28 no.2
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    • pp.186-189
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    • 2005
  • Anti-estrogenic activity of (-)-sesamin (1), helioxanthin (2), savinin (3), taiwanin C (4), and 3­(3,4-dimethoxybenzyl)-2-(3,4-methylenedioxybenzyl)butyrolactone (5) isolated from the root of Acanthopanax chiisanensis was tested using Ishikawa cells. Among them, compound 3 exhibited anti-estrogenic activity ($IC_{50}\;=\;4.86\;{\mu}M$).

Verification of Estrogenic Activity in Ethanol Extracts of Marine Organisms Using in vitro Test System. (In vitro 검출시스템을 이용한 해양생물 추출물로부터 에스트로겐 활성 검증)

  • 하종명;이상현
    • Journal of Life Science
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    • v.13 no.6
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    • pp.799-804
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    • 2003
  • In order to verify the occurrence of an estrogenic compound in natural products, the estrogenic activity was measured using an in vitro detection system. For this system, human breast cancer cell line MCF7 was transfected using an estrogen responsive CAT reporter plasmid. Estrogenic activities of photosynthetic algae spirulina and sea lettuce were evaluated using this system. Estrogenic activities of a $500\mug/ml\; and\; 50 \mug/ml$ ethanol extracts of spirulina were as much as that of $10^{-8}$M standard solution (17$\beta$-estradiol) and activity of $5\mug/ml$ ethanol extract of spirulina was as much as that of $10^{-10}$ M standard solution. However, no significant estrogenic activity was observed using sea lettuce extract. Estrogenic activities of marine animals, such as star fish and shrimp, were also evaluated using this system, however, no significant estrogenic activity was observed in these extracts. In this result, it is confirmed that spirulina extract possesses estrogenic compound.

Estrogen Activities of Extracts from Various Parts of Pomegranate(Punica grantum L.)

  • Lee, Eun-Mi;Kwak, In-Seob;Kim, Hyun-Jong;Park, Yong-Kon;Chung, Bong-Woo
    • 한국생물공학회:학술대회논문집
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    • pp.368-372
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    • 2005
  • Phytoestrogens are non-steroidal compounds found in a variety of plants, which exert estrogenic effects in animals. In this study, the useful compounds of pomegranate as preliminarily research for the developing of natural estrogen supplement were determined. The estrogenic activity of phytoestrogens in the pomegranate was estimated by using the Yeast Estrogen Receptor and E-screen assay. Estrogenic activity of all pomegranate extracts in the Yest Estrogen Receptor assay were not significant difference at all concentration. Whereas peel extracts of Iranian and domestic red pomegranate are significantly enhanced in the E-screen assay. When various pomegranate extracts enzyme and acid hydrolyzed, three aglycones of phytoestrogen, kaempferol, quercetin and catechin were detected. Peel extract of domestic red pomegranste contained more than kaempferol(87.0 mg%), quercetin(172.8 mg%)) and catechin(956.8 mg%) than other extracts. These differences in concentrations of key phytoestrogens among various extracts seemed to be responsible for their differences in estrogenic activities. Among these three compound, kaempferol showed the highest MCF-7 cell enhancing efface.

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An in vitro vitellogenin bioassay for estrogenic substances in the Rhynchocypris oxycephalus (버들치(Rhynchocypris oxycephalus)에서 에스트로겐류 물질에 의한 vitellogenin의 유도 및 단일클론항체 제작)

  • Shin, Jung-A;Song, Jae-Young;Lim, Hee-Young;Chang, Min-Ho;Lee, Hye-Min;Chung, Kyu-Hoi;Lim, Yoon-Kyu;Yoon, Byoung-Su
    • Korean Journal of Veterinary Research
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    • v.46 no.1
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    • pp.35-41
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    • 2006
  • Vitellogenin (Vtg), a phospholipoglycoprotein precursor of egg yolk is synthesized and secreted from the liver in response to estrogens in female fish. Vtg is normally undetectable in the blood of male fish, but can be induced by exposure to chemicals possessing estrogenic activity. Thus, the presence of Vtg in blood of male fish can serve as a useful biomarker for assessing previous exposure to estrogenic compounds. In the present study, Vtg was abnormally expressed in Rhynchocypris oxycephalus using estradiol benzoate ($E_2$). As the result, it was found that the level of Vtg in blood from R. oxycephalus was increased by treated quantity of $E_2$ with dose-effect manner. Monoclonal antibodies were generated against Vtg of R. oxycephalus. The hybridoma were screened with an enzyme immunoassay for the production of specific anti-Vtg antibodies. Five positive cell lines with a high specificity were selected. Monoclonal antibodies against vtg of R. oxycephalus that was developed in this study, may be a useful bio-indicator for the detection of estrogenic contamination in the aquatic ecosystem.

STUDY OF RESVERATROL AND ITS DERIVATIVES ON THE REGULATION OG GENE EXPRESSION IN MCF-7 CELLS TRANSFECTED WITH EITHER pERE-LUC OR phCYP1A1-LUC

  • Joung, Ki-Eun;Kim, Yeo-Woon;Sheen, Yhun-Yhong
    • Proceedings of the Korean Society of Applied Pharmacology
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    • pp.111-111
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    • 2001
  • Resveratrol (trans-3,4',5-trihydroxystilbene), which is a polyphenolic compound found in a variety of plants such as grapes and wine, has been reported to have a variety of anti-inflammatory, anti-platelet, and anti-carcinogenic effects. Recently resveratrol of was reported to serve as an estrogen agonist in MCF-7 cells Based on its structural similarity to diethylstilbestrol, a synthetic estrogen, we examined whether resveratrol and its derivatives might be estrogenic using stable MCF-7-ERE cells. Resveratrol functioned as a superagonist at high concentrations (i.e., produced a greater maximal transcriptional response than estradiol) Among the resveratrol derivatives, 10 compounds showed significant estrogenic activity.

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Effects of Exposure to Estradiol Benzoate or Flutamide at the Weaning Age on Expression of Connexins in the Caudal Epididymis of Adult Rat

  • Lee, Ki-Ho
    • Development and Reproduction
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    • v.20 no.4
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    • pp.349-357
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    • 2016
  • The present research was chiefly designed to determine the effect of the treatment of estrogenic agonist, estradiol benzoate (EB), or antiandrogenic compound, flutamide (Flu), at the weaning age on the expression of connexin (Cx) isoforms in the caudal epididymis of adult male rat. Animals were subcutaneously administrated with a single shot of either EB at a low-dose ($0.015{\mu}g$ of EB/kg body weight (BW)) or a high-dose ($1.5{\mu}g$ of EB/kg BW) or Flu at a low-dose ($500{\mu}g$ of EB/kg BW) or a high-dose (5 mg of EB/kg BW). Expressional changes of Cx isoforms in the adult caudal epididymis were examined by quantitative real-time PCR analysis. The treatment of a low-dose EB caused significant increases of Cx30.3, Cx31, Cx32, and Cx43 transcript levels but reduction of Cx31.1, Cx37, and Cx45 expression. Exposure to a high-dose EB resulted in very close responses observed in a low-dose EB treatment, except no significant expressional change of Cx37 and a significant induction of Cx40. Expression of all Cx isoforms, except Cx45, was significantly increased by a low-dose Flu treatment. Expressional increases of all Cx isoforms were detected by a high-dose Flu treatment. The current study demonstrates that a single exposure to estrogenic or antiandrogenic compound during the early postnatal developmental period is sufficient to disrupt normal expression of Cx isoforms in the adult caudal epididymis.

Effects of phytoestrogen on sexual development

  • Kim, Shin-Hye;Park, Mi-Jung
    • Clinical and Experimental Pediatrics
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    • v.55 no.8
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    • pp.265-271
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    • 2012
  • Phytoestrogen is an estrogenic compound that occurs naturally in plants. The most common sources of phytoestrogen are soybean products, which contain high levels of isoflavones. This compound, which has structural similarity with estrogen, can act as an estrogen receptor agonist or antagonist. Animal studies provide evidence of the significant effects of phytoestrogen on sexual development, including altered pubertal timing, impaired estrous cycling and ovarian function, and altered hypothalamus and pituitary functions. Although human studies examining the effects of phytoestrogen on sexual development are extremely limited, the results of some studies agree with those of the animal studies. In this paper, we review the possible mechanism of phytoestrogen action and the evidence showing the effects of phytoestrogen on sexual development in animal and human studies.

Estrogenic and Antiestrogenic Insecticides in MCF7-BUS Cell Line (피레스로이드계 살충제의 MCF7-BUS세포에 대한 에스트로겐 및 항에스트로겐 효과)

  • 오승민;정규혁
    • YAKHAK HOEJI
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    • v.45 no.6
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    • pp.694-700
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    • 2001
  • Synthetic pyrethroids are analysis of a natural chemical moiety, pyrethrin derived from the pyrethrum plant Chrysanthemum. The natural pyrethrin structure has been modified to be highly lipophilic and photostable, creating an effective pesticide and resulting in an increased presence in the environment. Worldwide, they are commonly used insecticides against ticks, mites, mosquitoes, and as treatment for human head lice and scabies. Therefore, human exposure to their compounds in extensive. Several studies on the effects of pyrethroids on thyroid hormone regulation, estrogen and androgen function have been reported and yet little has been done try assess their potential hormonal activities. Among humans, a pyrethroid compound was suggested to be the causal agent for gynecomastia in a group of Haitian men. The reports suggest that some pyrethroid compounds are capable of disrupting endocrine function. Therefore, we examined estrogenic/antiestrogenic potential of three pyrethroid insecticides, that is permethrin, allethrin and fenvalerate in human breast cancer cell and action mechanism mediated by the estrogen receptor. Fenvalerate showed weak estrogenic activity but aallethrin and permethrin showed no effect. In combination with high levels (10$^{-10}$ M, 10$^{-11}$ M) of 17$\beta$-estradiol and three synthetic pyrethroids inhibited cert proliferations in MCF7-BUS cell by 17$\beta$-estradiol. Whereas, fenvalerate increased cell proliferative activity at lower level of estradiol (10$^{-12}$ M, 10$^{-13}$ M). The relative affinities to the estrogen receptor were observed by allethrin and permethrin treatment, but not by fenvalerate. These results indicated that some of pyrethroid insecticides may modulate estrogen functions in human breast cancer cell. The action mechanisms of estrogen receptor mediated antiestrogenicity by allethrin and permethrin were postulated.

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Cytotoxicity of Environmental Estrogenic Compound, Bisphenol A, via Generation of Free Radicals (내분비계 장애물질인 Bisphenol A의 free radical 생성을 통한 독성발현)

  • 안광현;김봉희
    • Environmental health and toxicology
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    • v.18 no.3
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    • pp.175-182
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    • 2003
  • Bisphenol A shares similarities in structure, metabolism and action with DES, a known human teratogen and carcinogen. Bisphenol A, a monomer of polycarbonate and epoxy resins, has been detected in canned food and human saliva. The purpose of the this study was to evaluate the cytotoxicity, cell proliferation of bisphenol A In the presence of a rat liver S9 mix, contaning cytochrome P450 enzymes, and Cu (II). In the present study, Bisphenol A in combination with Cu (II) exhibited a enhancement in cytotoxicity which were inhibited by free radical scavengers. The content of malondialdehyde, an end product of lipid peroxidation, was also found to increase with concentration of bisphenol A. Also, we examined the change of CuZn-SOD, Mn-SOD, catalase and GPx activities in the MCF-7 cells exposed to bisphenol A. The activities of CuZn-SOD, CPx, catalase were found to decrease with bisphenol A concentration. Meanwhile, the activity of Mn-SOD was unchanged. This indicated that elevated oxidative stress caused by imbalance between the production and removal of free radicals occurred in cells.

STUDY OF RESVERATROL AND ITS DERIVATIVES ON THE REGULATION OF GENE EXPRESSION IN MCF-7 CELLS TRANSFECTED WITH EITHER pERE-LUC OR pCYP1A1-LUC

  • Joung, Ki-Eun;Kim, Yeo-Woon;Sheen, Yhun-Yhong
    • Proceedings of the Korean Society of Toxicology Conference
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    • pp.161-161
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    • 2001
  • Resveratrol (trans-3, 4', 5-trihydroxystilbene), which is a polyphenolic compound found in a variety of plants such as grapes and wine, has been reported to have a variety of anti-inflammatory, anti-platelet, and anti-carcinogenic effects. Recently resveratrol was reported to serve as an estrogen agonist in MCF-7 cells Based on its structural similarity to diethylstilbestrol, a synthetic estrogen, we examined whether resveratrol and its derivatives might be estrogenic using stable MCF-7-ERE cells. (omitted)

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